According to the text, what are the determinants of Internet use in nine Latin American countries?

The determinants of Internet use in nine Latin American countries were analyzed using microdata from official household surveys.
A Probit econometric model was used to determine how socioeconomic, occupational, and labor market variables affect the probability of an individual using the Internet.
Variables such as household per capita income, age, educational level, gender, and area of residence were considered in the analysis.
a) Only I is correct.
b) I and II are correct.
c) I, II, and III are correct.